/**
 * @file   hello.cpp
 * @author Zhao jingting <jtzhao@Zhao jingting.
 * @date   The Sep 20 22:59:23 2021
 *
 * @brief  A demo program
 *
 *
 */

#include <iostream>

/**
 * main function.
 *
 * @param argc number of shell parameters.
 * @param argv strings for all parameters.
 *
 * @return system signals.
 */

int main(int argc, char* argv[])
{
  ///Just a demo.
  std::cout << "Hello World!" << std::endl;
  return 0;
};
